Principles and practice of spinal adjustment; for the use of students and practitioners . nection with the middle cervical gang-lion of the sympathetic. This ganglion gives oflf the middlecardiac nerve, which divides into two branches. The oneon the right side receives a few branches from the recurrentlaryngeal nerve, and joins the right side of the deep cardiacplexus; in the neck it communicates with the superiorcardiac and recurrent laryngeal nerves. On the left side themiddle cardiac nerve joins the left side of the deep cardiacplexus. 3. The seventh and eighth cervical spinal nerves influe
Principles and practice of spinal adjustment; for the use of students and practitioners . nection with the middle cervical gang-lion of the sympathetic. This ganglion gives oflf the middlecardiac nerve, which divides into two branches. The oneon the right side receives a few branches from the recurrentlaryngeal nerve, and joins the right side of the deep cardiacplexus; in the neck it communicates with the superiorcardiac and recurrent laryngeal nerves. On the left side themiddle cardiac nerve joins the left side of the deep cardiacplexus. 3. The seventh and eighth cervical spinal nerves influencethe heart by their connection with the inferior cervical gang-lion of the sympathetic, which gives oflf the inferior cardiacnerve. This nerve communicates freely with the recurrentlaryngeal nerve and the middle cardiac nerve. 4. The third, fourth and fifth cervical spinal nerves, inaddition to the above mentioned connections with cardiacnerves, also give off the phrenic nerves which supply thepericardium, and which assist in the formation of the cardiacplexus. 138 SPINAL ADJUSTMENT. Parts Influenced by the SixthDorsal Nerve. ORGANS OF THE THORAX 139 5. The upper dorsal, spinal nerves, especially the second,have a powerful influence upon the action of the heart. 6. The fourth thoracic spinal nerves have a vaso-motorand inhibitory influence upon the heart. The action of theheart may be restored to normal by removing pressure uponthis nerve, as well as by percussion over the spinous processesof the first and second thoracic vertebrae. This influence ofthe fourth thoracic nerve upon the action of the heart may bereadily demonstrated by using the above described methodswhen it will be found that the number of heart-beats maybe reduced from ninety per minute to seventy in a fewminutes. 7. The lower thoracic spinal nerves, through their com-munication with the terminal fibres of the phrenic nerves,exert an indirect influence on the heart action. The Innervation of the Lungs.—The
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